Blog · October 14, 2026 · North Dakota
Sioux County Plat Book: finding and using one
Out toward Porcupine, plat books show ownership by township; the parcel viewer shows it today.
Main page: Sioux County, ND GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Looking for a Sioux County plat book? It's a printed atlas of landownership, usually by township, and it's handy for land around Lake Oahe. This Sioux County guide covers: how the atlas is organized, where to look for printed copies, and how the county viewer fills the gaps.
Tracking down a Sioux County plat book
For property near Selfridge, plat books are commercial atlases, showing rural owners and tract lines, page by page across the county.
Opening the official parcel viewer
Begin with the Sioux County Portico map; it maps every assessed parcel around Solen and Cannon Ball. For a parcel near Cannon Ball, put in a street address, an owner's name or a parcel number, then pick the result to center the map on it. With a lot near Fort Yates, save the parcel ID from that panel; every office in the county uses it to find the file.
A word on accuracy
For a parcel near Selfridge, listed acreage is a tax-roll number; only a licensed surveyor can set the real boundary on the ground. For a tract near Cannon Ball, records update in batches, so a deed recorded last month might lag behind.
Editions and availability
Editions come and go depending on publishers, try the county extension office, recorder's office or library near Selfridge.
Reading the legal description
North Dakota follows the Public Land Survey System, so deeds around Solen reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though real sections near Cannon Ball vary in size. Keep the legal description for land near Cannon Ball before you request a deed or survey.
Printing your own
Screenshot each section of the viewer around Cannon Ball to build your own up-to-date atlas.
Places you'll see on the map
Fort Yates is the county seat, where most land records are kept. Other places on the map include Selfridge, Solen, Cannon Ball, and Porcupine, where town lots give way to larger tracts. About 3,643 people live in the county (Census estimate, 2023) spread over some 1,094 square miles, especially near Cedar Creek. Sioux County was formed in 1914, so old deeds can run back a long way. Features like Cedar Creek, Missouri River, and Cedar River National Grassland help you orient on the aerial.
Who uses plat books
Buyers and seed dealers around Cannon Ball rely on them for a big-picture view of who owns what.
Land on the county line
Sioux County touches Adams County, Emmons County, Grant County, Morton County, and Corson County, SD, all with their own assessor records. Acreage along the edge near Fort Yates may be split across two assessors' files, so check the neighboring map before you assume the acreage. For land near Solen, our state page links every neighboring county map for North Dakota.
Getting answers from the right desk
Recorded documents for a parcel near Selfridge come from the County Recorder, often with an online index. Building or septic questions for a lot near Selfridge need the planning or permitting office, and the answer depends on jurisdiction.
Current ownership online
For current names, use the Sioux County Portico map, across the county.
The paper trail behind a parcel
Around Cannon Ball, the map is an index, not the title: deeds, subdivision plats and easements for parcels in the county sit with the County Recorder. Long-held tracts near Cedar Creek may trace back through several deeds, so a title company can sort it out before a purchase.
Two kinds of plat
Closer to Solen, a plat book is not a recorded plat: the recorded plat at the County Recorder is a legal document, while the atlas is a reference.
Using it on a phone
The parcel map usually runs in a mobile browser, which helps when you're standing on land near Fort Yates, though signal can drop in rural spots. A saved image of the lot near Solen and its lines keeps working without signal.
Questions about the Sioux County plat book
Should I use the Sioux County Portico map instead?
Generally, the county Portico map is free and updated more often around Lake Oahe.
Why does the plat book differ from the deed around Lake Oahe?
On ground around Fort Yates, the deed and a survey decide; they're good for orientation.
Are old plat books online for land near Porcupine?
For acreage around Cannon Ball, libraries and historical societies hold older editions; call ahead.
Who sells plat books near Cedar Creek?
Usually, the extension office or courthouse near Solen usually knows; online parcel maps fill the gaps.
What's the tax parcel number used for around Missouri River?
The parcel ID identifies one tax parcel near Cedar Creek; copy it before you call anyone.
Open the official Sioux County, ND parcel map See it in the Platbookmapper directory
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey, especially for fences, setbacks, or boundary disputes.